Grinding machine



1o placing work pieces on-the workrest blade of passed Sept. 13, 1932 UNITED ST TES ATENT" orricg.

can. a. museum, or 'rrrrsxnaen, rmmnm; assmnoa ,ro cmcnma'rr camnaas mconroaa'rnn, or cmcmnan, onIo, AJCYORPORATION or 01110 Ga ma/meme Application fled February 1032. lei-tulle. 595,708.

of an improved centerless grinder for expeditiously grinding small irregular shaped circular work pieces.

vision of improved means for expeditiously a centerless grinder. I p g A further objectof the invention is the provision of an automaticcenterless grinder for accomplishing the above objects.

'ent invention should be readily apparent by 'reierence to-the followin specification considered in'conjunction with the-accompanying drawings forming a part thereof and it is iv to be understood that any modifications may be made in the exact structural details there shown and described within the scope of the appended claims without departing from or exceeding the spirit of the invention.

In the drawlngs: Figure 1- is a front elevation of acenterless rinder embodying the improvements of this unvention. I

- Figure 2 is a top plan view of the mach ne 9 shown in Figure l. a

Figure 3 IS a sectional-view through the 1 grinding throat showing the parts therein in elevation, as particularly seen from line 3-3 on'Figurel. i a 1 Figure ,4 is a fra mentarysect1onal-v1ew- "takenon line Ho Fi re 3". 1

Figure 5 is a sectiona view taken online '55 ofFigure3. v

Figure 6 is a fragmentary sectional v ew .10 taken on line 6-6 of Figure 2.

' 5 Figure 9 is a fragmentary elevational view of the right hand end of the machine in Figure 1 as, seen thereon.

Figure 10 is anenlarged elevational view of particularly from 'line 9-9 certain ofthc parts shown in Figure 1 and machine tools and especially to improvements Other objects and advantagesof the presillustrating the yieldable tie between the upper and lower 5 ides. I i

Figure 11 is affragmentary sectional view taken on line 11.11 of Fi 2 Throughout the several views of the draw? ings similar reference characters are em- I .ployed to denote the same or similar parts. Another object of the invention; is the pro- A machine embodying this invention may comprise a'bed lfi'having rising therefrom at one end thereof the pedestal bearing'lfi for a spindle to which is secured agrindmgwheel l7 rotatable in a clockwise'direction at a high'grinding rate of speed. The .bedf'15 is also provided on its upper surface with guidev ways. 18 for a lower slide 19 adapted to be shifted relative to the bed toward and .from the grinding wheel. The slide 19 is provided on its upper surface with a'guideway20ion the upper slide 21 which has secured thereto" or formed integral therewith the bracket 22; Carried'b the housing and extending transversely-o the bed is a housing'orihead 23 containing a. spindle to which issecured' theg regulating wheel 24. The regulating wheelf' and its spindle are adapted to be rotated in a clockwise direction at a 'comparativelfslow work rotat on controlling rate of spee The proximate points of the grinding. and'reguvlating wheels travel in opposite directions and are spaced from one anothera distance to form a rinding throat in which the work tion. j 7 The work pieces 53 have an enlarged cenis dispose during the actual grindingopera terportion 53a'irom one sideof 'whlch pro -jects bearing ortion 53brwhile froml'the other side of w ich projects bearing portio ns 530' and 53d. It is desired to grind the reduced' or 'bearingportions 53b, 53c, and 53d concentric to one another but not to operate" on the enlarged centerportion 53a. For this reason the gri'ndin wheel 17 is provided with is. relieved portion which in practice aligns with the center portion 53a of the a work. Likewise the regulating wheel 24a provided in its operative face withaarelie f it or undercut 24 aligning in actual practice with thejenlarged portion 53a of the work.

The undercut 24a in the regulating wheel 24 "is greater than that necessary just to clear. the

1 with an elon ated opening 47, see Figure 5,

.wheels, the operativev surface 27 of t 26 is relieved at the pointof the enlarged l5 duced bearing portions of the workcontact portion 53a of the work so that only the rewith the operative surface 27 of the blade during grinding. Also carried bythe inner end of the slide 19 is a bracket 28 havin formed therein a hushed bore. 29..1na'x'ia.

alignment witha hushed boie formed in the work rest block 25. Passing through the. aligned bores 29 and 30 is an axially shiftable shaft oribar 31. This bar has secured to its outer end a head 32in which is formed a slot or groove 33 receiving a pin 34 tprojecting from a short armor lever 35 pmne or ,other-.

,wise, secured to one end of arock shaft 36.

The shaft 36 extends along theforwardiface of the machine, being journaled atoni end in a bearing 37 and terminating at other end I in a housing 38.

' The rocking of the shaft 36 through means to be later described, effects the longitudinal shifting of the bar 31 which has secured to it formovement therewith intermediate its ends asleev'e 39,the bar 31 and arts carriedthereby being shifted in the ot er direction by a s rin 39a. The sleeve 39 has projecting go there 1'0 111 on opposite sidespins 40 and 41 .respectively forming an anchor for one end of springs 42 and 43. The springs 42 and 43 have their other ends respectively secured .at

44 and 45 toa vertically disposed arm 46. The arm 46 is provided intermediate its ends .throu' h whic the sleeve 39 passes. Pins 48 e'xten from the sleeve 39 into the side of the opening 47 forpivotally mounting the arm to t e sleeve, and the said arm is maintained in a normal vertical position by means of the jsprings 42 and 43. The arm 46 has projecting from it near its uptper end a curved beam 49 {having a portion 0 5K5 its forward end considerably reduced to provide a stationary finger 50,, see Figure 4.' Secured to thebeam in alignment with the stationary finger 50 as by means of screws 51 is a spring finger52 forming a space between itself and the finger 50 of a smallerdimension than the diameter fof the body portion 53a of work piece 53, as

-ure.4. v Adjacent the mechanism just described is a work loading chute 54 of a V-shaped cross particularly shown in dotted lines in Fig-v section and, as shown in Figure 5, having at its inner end a stop pin 55 to prevent the discharge of the work pieces from the chute the upper end of the arm 46 for effecting its oscillation in a counterclockwise direction about the pivotpins 48. The work rest block 25 is also provided with a stop59 for engaging the lower end of the arm on its lateral face opposite to that engaged by the stop 58 for also oscillatingthe arm 46 in a counterclockwise direction.

As shownin Figures 3, 4 and 5, the parts are in the position with the bar 31 travelling to the left, as seen in Figure 3, and with the lowerend of thearm 46 just contacting with thestop 59. At this time the beam is in. the position shown in dotted lines in ,Figure and continued movement of the bar 31 to the left causes oscillation ofthe arm 46 causing the beam todip toward the work rest blade 26. The work rest'blade is provided on its face -towardgthe grinding wheel with a projecting point 60 adapted to engage with the spring finger 52 for lifting it free of the work piece whereupon the work piece drops by gravity onto the inclined operative face 27 of the blade. The projecting point or wedge 60 is of a width less than the width of the. groove 17a in the grinding wheel and lies idly therein during the actual grinding operation. After the'work piece has been deposited on the work restblade the reverse'movement of the bar immediately takes place whereupon the spring 42 returns the arm 46 to its normal positionagain placing the beam in the dotted line position shown in Figure 4, but without a work piece between the solid and spring fingers 50 and 52. The bar 31 continues to the arm 46 engages with the stop 58 Where upon the arm 46- is again oscillated in a counterclockwise direction; This movementv causes the beam to take the position indicated in dotted lines in Figure 5 and causes the fixed and spring fingers 50 and 52 to engage move to the right until the upper portion of a a a work piece lying at the base of the work 3 chute in alignment with the lateral openings 56 therein. The parts remain in this position until the work piece within the machine is completed whereupon a cycle as above de scribed is initiated. I

After the work piece is mounted on the work rest blade, the slides 19- and 21 are jointly actuated toward the grinding wheel carrying with them the work piece which is to fed into'the grinding wheel. For this purpose there isprovided an adjusting screw 61 having its threaded end threadedly engaged with a nut 62 carried by the bracket or housing 22 of the upper slide. The screw 61 has itsrear end 63 reduced which is received in a sliding block 64 disposed in a bearing 65 formed interiorly of the housing 38. The,

-screw being secured in said blockagainst axial but not rotative movement relative thereof and for axial movement therewith. The block 64 has pivotally secured to its opposite sides one end of links 67 and 68, the other endsof said links being respectively received between lugs 69 'and. 70 of abell crank 71. The bell crank 71 is pivoted by means of pins 72 and 73 to the rear wall of the housing 38 and a partition 7 4 disposed interiorly of the said housing. The depending arm 7 5 of the bell crank 71 is provided with h an adjustable roller 76 received in cam track 7 7 of rotating cam 78. This cam is keyed or at-ion. The gradual rising portion 87of the" cam is followedby the concentric ortion 88 a 140 otherwise secured to camshaft 79 rotatably journaled in'a bearing 80 interiorly of the 's provided with an abrupt portion 861 for rapidly advancing the work into contact with the wheel, which por' tion 86 terminates in a gradually rising portion 87 for feeding the work into the grinding wheel for effecting the actual grinding operfor holding the parts comparative y stationary to effect the rounding upjof thework andthe sparking out between the work and grinding wheel. The cam is then provided with an abruptportion 89 for rapidly retracting 92 has formed therein an elongated perforathe work from the grinding wheel.

From the foregoing it Will be noted that after the workpiece has been mounted on the work rest blade it is actuated toward the grinding wheel to'reduce it to the desired size and form and then withdrawn therefrom.

'l he cam 7 8 is provided on its rear surface witha raised cam portion 90 adapted to contact with 3, lug 91- projecting from the adj aeent face of a pivoted arm 92 pivoted at one end 93 to a lug carr-iedbythe housing 38 interiorly thereof. The, upperend of the. arm

tion 94 receiving a pin 95 projecting from the side of a slidable bar 96 actuable through suitable bearings provided by the housing 38'. The forward end of the bar 96 is provided with a substantially hooked nose 97 co-operatiug with the ratchet tooth 98 formed on disc member 99. The disc'99 is rotatably journaled in cars or lugs 100 extending inwardly from the forward wall ofthe housing as and the said disc has a splined ,connectionfas at 101 with the end of the rock shaft 36 which terminates within the housing 38'; The. cam

78 is continuously rotating for continuously shifting'the upper "and lower slides toward and from the-grinding wheel. At each com- "pletecycleof movement lof 't he said slides the arm 92 is oscillated for. rocking the shaft 36 and thereby operating the feeding mocha nism as above described in detail. j

g In order to discharge the work from the work rest blade, the said blade and the regu lating wheel are adapted'to-be' relatively separated to thereby allowthe work to roll by gravity down the inclined operative face of the blade into a suitable receptacle placed for the reception of saidwork pieces. This is accomplishedby means of an adjustablestop screw 102 carried by a 'bracket' 103 secured to the rearmost portion of the bed,' 'which stop screw is adapted to engage the rear end of the lower slide 19 therebyfstopping' any further movement of said slide while permitting' the upper slide tot'raVeLbeyQnd the lower slideand since the work, rest blade'is carried by the lower slide and the wheel by the upper slide' a relative 3 separation will take place. In orderthat the wheeland work.

rest assume their normal positions, thelower slide has projectingffrom it a pin-104 to which one end of a spring 105 is attached, the

other end of the spring beingattached to an adjustable screw 106'adju'stably threaded into a bracket 107 carried by the upper slide 21. A positive couplingis had betweenthe slides by means of'the adjustable stop screw 108 extending through the bracket 107 and-contacting with the rearmost surface of the lower slide so that when the upper. slideisactuated to the left, as seen inFiguresl. J

2 and 10, it carries with-it the lower slide 21. The timingbetween the 'cam track77 of the cam 78 and the cam lug, 90 is such that the separation betweenthe'regulating wheel and work rest blade'takes place and the parts assume their normal positions before the work loading mechanism is operated or before the oscillation of the lever 93. From the foregoing it will be seen that there has beea provided any automatic centerless grinder for expeditiously loading small: work pieces into thev grinding throat of a centerless grinder and for expeditiously and properly effecting the grinding thereof.

What is claimed is:

1. In a centerless grinderthe combination of a pair of opposed grinding and regulating wheels forming a grinding throat therebetween, a work rest blade within said throat.

a work delivery chute adjacent thethroat and i in alignment therewith, and means for trans ferring work pieces individually from the work deliverylchute to the work rest blade.

comprising an arm slidably and pivotally mounted for movement between the work chute and the work rest blade.

2. In a centerless grinder for grinding inbination of a pair of opposed grinding and regulating wheels spaced from one another to form a grinding between the work rest blade and work chute for transferring work pieces from the chute to the blade, and means pivotally mountin the arm for oscillatory movement at each en of its transfer travel forremovinga work piece from the chute and depositmgsame on the blade. 7

3. In a centerless grinder for grinding dependent portions of a work piece the combination of a pair of opposed grinding and regulating wheels spaced from one another to form a grinding throat of the desired size,a work rest blade within the grinding throat, a work delivery chute terminating at a point adjacent the work rest blade, an

arm movable between" the work rest blade and work chute for'transferring work pieces from the chute tothe blade, means pivotally mounting the arm for oscillatory movement at each end of its transfer travel for removing a work piece from the chute and depositing same on the blade, yi'eldable means for holding the arm in its normal position during the transfer movement, and means for actuating the arm.

4. In a centerless grinder for grinding independent portions of a WOIk p1e (38 the I combination of a pair of opposed grinding and regulating wheels spacedfrom one an-;. f other to form agrindingthroat of the dG-' sired size, a work rest blade within the grinding throat, a work delivery chute terminating at a point adjacent the .work're'st blade, an arm movable between the work rest blade and'work chute for transferring work pieces fromthe chute to the blade, means pivotal- 1y mounting the-arm for oscillatory-movement at each end of its transfer travel, for

i removinga work piece from the chute and depositing same on the blade, yieldable means for holding the arm in its normal position during'the'transfer movement, means for actuating the arm, and means actuating one of the wheels toward the otherifor effecting a relative feed between the work and grinding wheel. 1

5. In a centerless grinder for grinding independent portions of a'work piece the combination of a'pair of opposed grinding and regulating wheels spaced from one another to form a grinding throatpof the desired size, a work rest blade within the grinding throat, arwork delivery chute terminating at a point adjacent the work rest blade. anarm movablebet'ween' the work rest blade and work dependent portions of a work piece the com I work piece from the throat of the desired size,

a work rest blade within the grinding throat, a work delivery chute terminating in a point my *19 adjacent the work rest blade, an arm movable toward the other for effecting a relative feed 'between the work'and grinding wheel, and

scribed the combination grinding and regulating wheels spaced from 1 minating adjacent transferring the work ,slide for transferring work pieces from the 'meanssynchronizing the movement of the farm and the movement of the wheel with one another whereby the work is transferred during the time the wheels a stationary. j

6. In a centerless grinder of the class deof a pair of opposed e held relatively one another to form a I grinding throat therebet-ween, a work rest lade dis osed within a the throat, a slide supporting t e work rest blade, a second slide superimposed on the first for supporting the regulating wheel, a

yieldable tie between the said slides whereb they may be actuated jointly and indepen ently, means limiting the independent movement of the slides, a work del very chute in alignment with the grinding throat and terthereto,.-the work rest blade having an inclined operative surface, means transferring work pieces from the chute to-the angle surface of the workrest blade, and means actuating the slides and 'yhereby the work is deposited on the blade while the slides are held against independent movement and vwhereby independent actuation ofthe slides causes thework to -be discha'rgedfrom the blade by gravity.

7. In a mechanism for placing work pieces on the work rest blade of a centerless grinder the combination with such a work rest blade, of a work delivery chute terminating adjacent thereto for conveying work pieces by Tim gravity to the end thereof, and means for blade, comprising an gravity to the end thereof, means for transferring the work from the chute to the blade. comprising an arm adapted to have oscillatory and rectilinear movement relative to the blade and chute, yieldable means normally 12 holding the arm in a vertical position, means operable at one end of the rectilinear movement of the arm for oscillating same towards the work chute to effect a pick up of the work therefrom by the arm, and additional means 12.?

transfer means in timed sequential order 10 from the chute to the k arm adapted to have oscillatory and rectilinear movement relacent'thereto for conveying. work pieces by 121 operable at the other end of the rectilinear movement of the arm for causing the arm to deposit the work onto the work rest blade.

9. In a mechanism for placing work pieces on the workrest blade of a centerless grinder the combination with such a work rest blade, of a work delivery chute terminating adjacent thereto for conveying work pieces by gravity to the end thereof, means for transferring the work from the chute to the blade,

-* comprising an arm adapted to have oscillatory and rectilinear'movement relative to the blade and chute, yieldable means norr mally holding the arm in a vertical position,

means operable at one end of the rectilinear movement of the arm for oscillating same towards the work chute to effect a pick up of the work therefrom by the arm, additional means operable at the other end of the rectilinear movement of the arm for causing the arm to deposit the work onto the work rest blade, and means associated with the arm for holding the work piece including a nonyielding finger and a yielding finger spaced from one another a distance less than the size of the work to be carried thereby.

10. In a mechanism for. placing work pieces on the work rest blade of a centerless grinder the combination with such a work rest blade, of a work delivery chute terminating adjacent thereto for conveying work pieces by gravity to the end thereof, means for transferring the work from the chute to the blade, comprising an arm adapted to have oscillatory and rectilinear movement relative to the blade and chute, yieldable means normally holding the arm in a vertical position, means operable at one end of the rectilinear movement of the arm for oscillating same towards the work chute to eifect a pick up of the work therefrom by the arm, additional means operable at the other end of the rectilinear movement of the arm for causing the arm to deposit the work onto the work rest blade, means associated with the arm for holding the work piece including a non-yielding finger and a yielding finger spaced from one another a distance less than the size of the work to be carried thereby, and means carried by the work rest blade for opening the distance between the fixed and yielding ffingers for thereby releasing the work thererom.

11. In a centerless grinder of the class described the combination of a bed, a grinding wheel rotatably mounted thereon, a regulating wheel carried by thebed for movement toward and from the grinding wheel, the grinding and regulating wheels forming a grinding throat between them, a work rest blade within said grinding throat, and meansfordepositing work pieces on the work rest blade, comprisin a rod slidable in a direction extending axlally of the grinding throat,l

an arm pivoted to the rod, means carried by the rod and arm for normall holding the arm in a vertical position or rectilinear movement with the rod, a work chute terminating adjacent the work rest blade, and means carried by the arm. for supporting a work piece to transfer same from the chute to the blade.

12. In a centerless grinder of the class described the combination of a bed, a grinding wheel rotatably mounted thereon, a regulating wheel grinding and re ulating wheels forming a grinding throat etween them, a work*-'rest blade within said grinding throat, and means for depositing work pieces on the work rest blade, comprlsing a rod slidable in a direction extending axially of the grinding throat,

an arm pivoted to the rod, means carried by the rod and arm for normally holding the arm in a vertical position for rectilinear movement with the rod, a work chute terminating adjacent the work rest blade, means carried by the arm for supporting a work piece to transfer same from the chute to the blade, and means for oscillating the arm about its pivotal mounting for engagin work by the work carrying vportion 0% arm when at one end of its rectilinear movement and for oscillating the arm to deposit the work carried thereby onto the work rest blade when at the other end of its rectilinear movement.

13. In a centerless grinder of the class described the combination of a bed, a grinding wheel rotatably mounted thereon, a regulatcarried by the bed for movement 1 toward and fromthe grinding wheel, the

the i the ing wheel carried by the bed for movement toward and from the grinding wheel, the grinding and regulating wheels forming a grinding throat between them, a work rest blade within said grinding throat, and means for depositing work pieces on the work rest blade, comprising a rod slidable in a direction extending axially of the grinding throat, an arm pivoted to the rod, means carried by the rod and arm for normally holding the arm in a vertical position for rectilinear movement with the rod, a work chute terminating adj acent the work rest blade, means carried by the arm for supporting a work iece to transfer same from the chute to the lade, means for oscillating the arm about its pivotal mountingfor engagingthe work by the work carrying .portion of the arm when at one end of its rectilinear movement and for oscillating the arm to deposit the work carried thereby onto the work rest blade when at the other end of its v rectilinear movement, and means associated with the work rest blade for releasing the work piece carried by the arm.

14. In a centerless grinder of the class described the combination of a bed, a grinding wheel'rotatably mounted thereon, a regulatingwheel carried by the bed for movement toward and from thegrinding wheel, the

rod and arm for normally holding the arm in a vertical position for rectilinear movement with the rod, 3. work chute terminating adjacent the work rest blade, means carried by the arm for supporting a work piece to transfer same from the chute to the blade, means for oscillating the arm about its pivotal mount-. ing for engaging the work by the work carrying portion of t e arm when at one end of its rectilinear movement and for-oscillating the arm to deposit the work carried thereby onto the work rest blade when at the other end of its rectilinear movement, means associated with the work rest blade for releasing the work piece carried by the arm, means for effecting a relative feed between the work and grinding wheel to reduce the size of the work on-the work rest blade, and means for efi'ecting a relative separation between the regulating wheel and work rest .blade at theconclw sion of the grindin operation to effect discharge of the work rom the blade.

In testimony whereof, I aflix my signature.

CARL G. LTLJEBERGn, 

